Condo Renovation and MCST Rules: What to Check Before Hacking

Ron Quek

10 minutes ago

5 min read

Renovating a condo in Singapore is not the same as renovating an HDB flat. There is no HDB renovation permit. Instead, your estate's management corporation (MCST) sets house rules, and some works also need approval from agencies such as BCA or URA. URA said this month that it keeps seeing suspected unauthorised works in residential units, and that owners generally need approval or advice from three parties before starting: the MCST, government agencies and a qualified person (The Straits Times, 11 Oct 2026). This guide covers the condo renovation MCST rules worth checking before anyone picks up a hacking tool.

Rules vary by estate. Hours, deposits, forms and approval times are set by each MCST, so treat this as a list of what to ask, not fixed rules. For the bigger picture, see our HDB vs condo renovation guide.

1. Get your estate's by-laws and renovation guidelines first

Every strata development is governed by by-laws, and the MCST can add its own by special resolution. Under Singapore's strata law, the MCST must display its by-laws on a notice board on the common property and, if you apply in writing as an owner, supply you a copy for a capped fee (Building (Strata Management) Act 2004, s 32). Most estates also have a renovation application form or guidelines at the management office. Ask for both, then check:

Permitted renovation hours and days, including shorter hours for noisy works such as hacking, and weekend and public holiday rules
The application process: which drawings to submit and how long approval usually takes
Any renovation deposit: whether one is required, how much, and what it can be deducted for
Lift, loading bay and access: service lift booking, lift protection and routes for materials
Debris disposal: where renovation waste goes and who removes it
Contractor registration: worker passes, parking for contractor vehicles and any security sign-in

These sit on top of the standard by-laws for estates whose MCST was constituted on or after 1 April 2005. For example, owners must not make noise likely to disturb neighbours, must move large objects through common property in the way the MCST has resolved, and must not leave rubbish or other material on common property without written approval (prescribed by-laws 1, 3 and 9). For a new condo, BCA also suggests checking renovation restrictions with the developer or MCST and in your Sale and Purchase Agreement (BCA).

2. Hacking: structural or not?

BCA says structural elements such as slabs, beams, columns and walls cannot be altered without proper assessment by a Professional Engineer, and approval from the Commissioner of Building Control is also required (BCA). In a condo you often can't tell by looking whether a wall is structural, so check the approved plans before you design around removing it.

Expect your MCST to ask for paperwork even for walls that are not structural. In an advisory to MCSTs (BCA, 2014), BCA advised that before approving renovation involving demolition (other than floor tiles):

Structural demolition needs plans approved by the Commissioner of Building Control and a permit to start, with the works supervised by a Qualified Person
Non-structural demolition should come with renovation plans endorsed by a Professional Engineer (Civil or Structural) certifying that no structural works are involved, drawn from the original approved plans
Demolition works should be done by contractors with trained workers certified by the BCA Academy

The advisory also suggests MCSTs keep the approved structural plans for owners to refer to, carry out spot checks, and stop work if reinforcement bars are exposed until a Professional Engineer has assessed it. Ask management early whether they hold those plans and whether your estate needs a PE endorsement.

3. Anything that changes the facade or adds floor area

Under the strata law, you need the MCST's authority for any improvement that affects the appearance of a building in the estate. The MCST can approve it only if it won't detract from the building's appearance or is in keeping with it, and won't affect structural integrity. Works that increase floor area need a 90% resolution, and planning permission rules still apply on top (Building (Strata Management) Act 2004, s 37).

BCA's examples of floor-area works include roofing over a private enclosed space and putting a slab over a void, while awnings or coverings need the MCST's permission (BCA). URA's examples of unauthorised works include enclosing a patio, enclosing a roof terrace and building a loft of more than 5 sq m. Under the Planning Act and the Building Control Act, these can lead to fines of up to $200,000, and insurers may not cover claims linked to unauthorised works (The Straits Times). URA also said owners must fix or regularise unauthorised works even if they were there when they bought, which matters for resale buyers.

4. Window grilles, windows and safety items

The law lets you install certain safety equipment even if a by-law says otherwise. This covers window grilles and screens, railings, window restrictors, insect screens, intruder alarms and locks. You must install them competently, keep them in keeping with the building's appearance, and repair any damage to common property (Building (Strata Management) Act 2004, s 37A). Ask whether your estate has an approved grille design before ordering.

Replacing windows is different. BCA says window installation and replacement must be done by an approved window contractor (registered under workhead RW01) or a builder, with a trained window installer (BCA). Windows are part of the facade, so check the MCST's rules too.

5. Common property: corridors, lifts and external walls

BCA notes that common property includes the external walls of your unit (BCA). Under the standard by-laws, you need the MCST's prior written approval to mark, paint, drill or nail into any structure that is common property, and you must not block common areas except on a temporary, non-recurring basis (prescribed by-laws 3 and 5).

Your pre-hacking checklist

Copy of the by-laws and renovation guidelines from the management office
Approved floor and structural plans for your unit, to confirm which walls are structural
PE endorsement if your estate requires it for wall removal, and Commissioner of Building Control approval for anything structural
Written MCST approval for your renovation application before works start
Hours, deposit, lift booking, debris and contractor passes confirmed with management and shared with your contractor
Facade, balcony, window or floor-area changes flagged early, with a Qualified Person to advise on approvals (BCA)
New condo? Report defects to the developer during the Defects Liability Period before renovation covers them up (BCA)

Questions to ask your interior designer

Who prepares and submits the MCST renovation application?
Have you checked the approved plans for the walls we want to remove? Who engages the Professional Engineer if one is needed?
Does anything in the scope touch the facade, balcony or floor area?
Is the quotation itemised? See our quotation red flags guide and how to pay your renovation firm safely

Our renovation consultation checklist lists what else to prepare, and our renovation process guide covers the steps to handover. For layout ideas, see condo bedroom and home study ideas.

Where Blackwoods Interior fits

Name: Blackwoods Interior · Blackwoods Interior Pte. Ltd.
UEN: 201909521M
HDB: listed on HDB's Directory of Renovation Contractors (DRC)
CaseTrust: accredited renovation business, valid through 28 April 2028 (what CaseTrust means)
Contact: WhatsApp 8754 3212 for a free 30-minute consult (Mon-Sat, about 10:00-19:00 SGT) · Hello@bwi.sg
Showroom: 62 Ubi Rd 1, #01-15 Oxley Bizhub 2 (by appointment) · office at 125 Bukit Merah Lane 1 #04-178

Next step

Planning a condo renovation? WhatsApp 8754 3212 or email Hello@bwi.sg with your estate, unit type and floor plan to book a free 30-minute consult. Send your estate's renovation guidelines too, and we'll go through what your scope needs before work starts.

Sources: BCA, Singapore Statutes Online and The Straits Times, checked 14 October 2026. Your estate's by-laws and the authorities' current rules take precedence, so confirm with your MCST before you start. Cover image: illustrative concept, not a completed Blackwoods project.

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